Chromatin immunoprecipitation (ChIP) assays showed significant enrichment of binding by an anti-RPLP1 antibody to the fragment containing a C/EBPβ binding site in both HEK293T and Jurkat cells, whereas there was no enrichment with the control fragment containing an Sp1 interaction site upon HIV-1 infection (Fig. 3a, b). Here, SP1 is linked to HIV-1 infection.